Tailstock for automatic lathes



Nov. 6, 1928.

J. J. THACHER TAIL STOCK FORAUTOMATIC LATHES Filed Jan 22, 1927 INVENTUR UWLM I TTURNEY nFl v h 00 T v N in -L r L a 3 W F a I u m mu m. i 2 s a Jm% i m :n u J l i huflllll ll! Mn fmu rM QM. MM) 8 0% a 8 mm I 2 2 l1 OM hi 3 2 Patented Nov. 6, 1928.

UNITED STATES PATENT OFFICE.

JOHN J. THAGHER, or WETHERSFIELD, CONNECTICUT, ASSIGNOR 'ro PRATT & wnrn' NEY COMPANY, or NEW YORK, N. Y., A CORPORATION or NEw'JnnsEY.

TAILSTOCK FOR AUTOMATIC LATHES.

Application filed January 22, 1927. Serial No. 162,779.

This invention relates to an improved form of tailstock adapted for use in an automatic lathe such as described and claimed in patent to Muller 1,252,928.

More particularly the invention relates to operating mechanism for a tailstock spindle such as shown and described in my previously granted Patent 1,545,074.

An object of the present invention is to provide adjusting means for a tailstock spindle adapting the tailstock to'be positioned along the bed of the lathe for different lengths of work Without requiring re-adjustments to be made of any parts for operating the tailstock.

Another object ofthe invention is to provide improved operating mechanism for a lathe spindle to frictionally force the tallstock spindle forwardly or rearwardly into and out of operative engagement with work inlthe lathe in any adjusted position of the tailstock. I

Another object of the invention is to provide an oscillatory shaft within the base of the lathe adapted to be oscillated by cam means, the oscillatory shaft being connected through a spline to actuating means for the spindle.

lVith these and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of this specification, I have shown my invention embodied in a tailstock for an automatlc lathe, but it will be understood that the invention can be otherwise embodied and that the drawings are not tobe construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

' In the drawing:

Figure 1 is a partial front elevation of an 15 automatic lathe providedwith thepresent form of tailstock and actuating means.

Fig. 2 is an end elevation of the same.

Fig. 3 is a sectional View taken upon the line 33 of Fig. 1.

Fig 4. is a fragmentary plan view, partly in section, showing the operative connection between the pivotally mounted lever and the oscillatory shaft.

Fig. 5 is a detail and portion of the invention, j

1 Fig. 6 is a detail view of a hand adjusting eve In the above mentioned drawing I have shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly and in its broadest aspect, my invention comprises the following principal parts: first, a tailstock comprising a frame adapted to be adjusted to any position along the ways of a. lathe; second, a tailstock spindle slidably mounted for movement longitudinally within the tailst-ock; third, a collar friction ally engaging the spindle; fourth, a pivotally mounted lever engaging this collar so that oscillatory movementof the lever will move the collar and force it to frictionally move the spindle in either direction fifth, a segmental gear formed on this pivotally mounted lever; sixth, a corresponding segmental gear splined to an oscillating shaft mounted within the lathe bed so that the oscillating lever may be actuated by oscillation of the shaft with the tailstock in any position; and seventh, a cam operated lever to oscillate the shaft.

Referring more in detail to thefigures of the drawing, the tailstock 10 is shown as a frame mounted slidably upon suitable ways 11 extending longitudinally along the base 12 of a lathe, a portion of the base being shown in Figs. 1 and 2. By means of a nut 13 and screw 14 extending above the tailstock 10, the tailstock 10 may be secured rigidly to the base 12 in any adjusted position. As these securing means form no part of the present invention, it is not thought that further description is necessary. Also, as shown in Figs. 1 and 3, the tailstock 10 is divided horizontally, the upper portion indicated by 10 .being laterally adjustable relative to the lower portion 15 by adjusting screws 16 of the usual type shownin Figs. 1, 3 and 4.

Extending longitudinally within the tailstock 10 is a slide member 17 having a work engaging center 18 at one end.v Frictionally engaging this slide 17 is a collar member 19 which may be adjusted to Contact with the slide 17 with any desired pressure by adjustment of the screw 20 shown most clearly in Fig. 3. This collar 19 is adapted to engage the slide 17 firmly enough to force i shown and described in my above mentioned the slide 17 into contact With-the Work but, upon engagement oftliecenter 18 With the Work, the collar 19 may move forwardly over the" slide 17 sufiicientlyfar to engage a roller 21 With al-clampingilever 22. similar to one Patent 1,545,074.

' In order to actuate this frictionally mounted collar 19, a shaft 24 is mounted for rot;

tionwithin the base 12 and is suitably held against endwise movement. At one end of the lathe a bracket 25 is provided having a ro tatably mounted sleeve 26within which the shaft 24 is keyed. I This sleeve 26 is attached to a depending oscillating lever. 27, adapted. to be actuated by suit-able ca'ms 28 and 29 on the end ofa main cam shaft 30 within the base 12; As shown in Fig. 2 the sleeve 26" ad I lever 27 are'adapted to he angularly adj u's-ted Within narroiv -liniits by'means of oppositely disposed'adjustingscrews 31. It will be seen a from this vconstruction rotationoffthe main cam shaft 3'0', Whicli-. is rotated in one direction during operation of the lathe will i force the lever 27 to vbe oscillated this oscillatory movement correspondingly oscillating the shaft 24', extending along the upper portion' of thehfase 12.4

Splined to this oscillating shaft member 32 carrying a segmental'hevelgear g'adapted'to: be engaged by a corresponding segmental bevel gear on the loWei-" end of the pivotally mounted lever This lever 35, as shown in Figs. Qan'd 4, ismounted Within the lower portion of the tailstock lower member 15 upon a short "transverse shaft 3 so thatas the oscillating shaft?! oscillates hack and forth by action of the cams 28 the pivotally mountedv lever 35' will be correspondingly actuated. 1 p y At the'upper end ofthis pivotally mounted lever 3'5 are gear teeth l 'adapted to rack teeth 38 fo -medf'on horizontal surface of the collar mounted on the spindlel'Z.

" It will beseen, therefore, tliat oscillatory movements of the lever 2"? due to the canis28 and-29 on the main cam shaft- 80Willceuse the collar 19/00 be positively movedback and forth relative to the tailstocl 10 and this movement or" the collar19 will correspondi'ngly frictionally move the spindle '17 into and "out of'work engagingpositioii.' i

The cams'28 and 29 are so positioned that :When ahlanl: is to be mounted in thelathe the oscillating lever 27 is moved toward the;

axisfof the main cam sha t3 This movement,i through the oscillating shaft 27 'Cl16 segmental gears 38and Zundthe pivotalv lever 35 moves the collar 19 and spindle t ward the i p a A transverse locking holt isprovided in Ithe tailstock adaptedupon being slightly tilted, to bind against the spindle 117 l his maybe operatedjin the sameiiianner as in my previously granted patent by the resilient position.

24; is a arm 22 engaging the rollerQlon thesazddle 19. Also, as in my previously granted patent; the roller 21 is mounted on the lower end oi handle 43-pivotal1y mounted on the saddle 19.. oscillatii J. l

the; ldi tliis roller 21 may be moved nto and out of operative What I claim is:

1. Atailstoc'k forl'athes comprising in combination, a frame adapted to be ad' ustably positioned on a lathe bed, a spindle Iongi tudinally movable therein, means to move said spindle Within said frame comprising an oscillating shaft mounted adjacent the frame; a pivotally mounted leve'r adapted to be actuated by" oscillatory" movementof said shaft, and means" frictional'ly connecting said pivotally mounted lever and. spindle;

Atailstock for lathes comp'risingincombination, a frame adapted to be adiustah'lyi positioned on a lathe bed, a spindle ion-glu dinall'y' movable therein, means to move said spindle- Within said frame; comprising an oscillating shaft mountedadj-acent the fr anie cam means to positively oscillate said shaft,

a pivotal'ly mounted lever adapted to heactusaid shafh a collar" frictionally engaging the spindle, and means coim'e'cting said pivotal'ly mounted lever and said collar.

evfAtailstockfor lathes comprisin in combination; a frame adapted to be adjustahly' positioned on lathe bed, a spindle longitudinally movable" therein, means to move: said spindle within said frame comprising an oscillating shaft adjacent the frame and exe tending parallel to said spindle, a pivotally mounted lever coo'peratingby means of segmental gears on said pivotally' mounted lever and said oscillating shalt With said shaft whereby said lever is adapted to be oscillated by oscillatory movement of said shaft, and means irrationally connecting said pivotally mountedlever and spindle.

5. A tail'st'ock for lathescomprising iu combination, a frame a'daptedto he adjustahly positionedon a lathe bed, a spindlelongitudinally movable therein, a collar 's'lidahly mounted on sa-id slide, means to move said spindle Within said frame comprising anio'scillating shaft mounted adjacent the frame, a pivotally mountedlever adapted tobeaetuated by oscillatory movement of said shaft,

and gear toothed means connecting said pivotally mounted level and said collar.

6. Atailstock for lathes comprising in combination, a frame adapted to be adjustably positioned on a lathe bed, a spindle longitudinally movable therein, means to move said spindle Within said frame comprising an oscillating shaft mounted adjacent the frame,

a cam operated oscillating lever connected to said shai't, a pivotally mounted lever adapted to be actuated by oscillatory movement of said shaft, and gear toothed means connecting said pivotally mounted lever and spindle.

In testimony whereof, I hereto aflix my signature.

' JOHN J. THACHER. 

